I have a project with external user and internal users and I need that the external user will see only few of the internal users and not all of them.
i mean, if he create new issue so he will be able to do asignnee to some internal users and some not.
how can I do that?
You can't natively. Either an assignee is in the list, or they are not (because the permissions say so). The field does not care who is trying to assign the issue, other than that they have the permission to assign issues.
Your options are
1. Find or write a replacement field plugin which is aware of the user doing the assigning, and can limit the assignee list (for full Jira functionality, you'd actually then put the result into the standard assignee field)
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